<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			//简单表达式
			var a = 5;
			console.log(12345)
			console.log(a)
			//复杂表达式
			console.log(1+1)
			console.log(10*10)
			console.log(12345*56461)
			//数据类型
			console.log(1)
			console.log(-1)
			console.log(3.14)
				//无穷大
			console.log(Infinity)
				//无穷小
			console.log(-Infinity)
				//非数字
			console.log(NaN)
			//字符串类型
			console.log("你好")
			//undefined(未定义，空值)
			console.log(undefined)
			
			console.log(!false)
			
			console.log(typeof 1)
			console.log(typeof "你好")
		</script>
	</body>
</html>
